Retractable knife



FIG. 1 is a side elevation view of the retractable knife of my design, showing a blade of the retractable knife in a storage position.

FIG. 2 is a side elevation view of the retractable knife, showing the blade of the retractable knife in an intermediate position.

FIG. 3 is a side elevation view of the retractable knife, showing the blade of the retractable knife in a use position; and,

FIG. 4 is an exploded perspective view of the retractable knife.

The broken lines shown in the drawings depict portions of the retractable knife that form no part of the claim. 

CLAIM The ornamental design for a retractable knife, as shown and described. 